Compare 21979 vs 21991
| Property | 21979 | 21991 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 311 × 7091 | 219911 |
| Prime factorization | 31 × 709 | 21991 |
| Divisors count | 4 | 2 |
| Divisors | 1, 31, 709, 21979 | 1, 21991 |
| Number of properties | 1 | 5 |
| Chen primes | 1208th | |
| Isolated primes | 1720th | |
| Primes | 2463rd | |
| Semiprimes | 5549th | |
| Sexy primes (1st member) | 742nd | |
| Sexy prime triplets (1st member) | 202nd | |
| Roman numberals | ||
| Base 2 | 1010101110110112 | 1010101111001112 |
| Base 3 | 10100110013 | 10100111113 |
| Base 4 | 111131234 | 111132134 |
| Base 5 | 12004045 | 12004315 |
| Base 6 | 2454316 | 2454516 |
| Base 7 | 1210367 | 1210547 |
| Base 8 | 527338 | 527478 |
| Base 9 | 331319 | 331449 |
| Base 10 | 2197910 | 2199110 |
| Base 11 | 1557111 | 1558211 |
| Base 12 | 1087712 | 1088712 |
| Base 13 | a00913 | a01813 |
| Base 14 | 801d14 | 802b14 |
| Base 15 | 67a415 | 67b115 |
| Base 16 | 55db16 | 55e716 |